CN102747309A - Steel for enamel and production method thereof - Google Patents
Steel for enamel and production method thereof Download PDFInfo
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- CN102747309A CN102747309A CN2012102648471A CN201210264847A CN102747309A CN 102747309 A CN102747309 A CN 102747309A CN 2012102648471 A CN2012102648471 A CN 2012102648471A CN 201210264847 A CN201210264847 A CN 201210264847A CN 102747309 A CN102747309 A CN 102747309A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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Abstract
The invention discloses a steel for enamel, and is characterized by comprising the following chemical elements by mass: not more than 0.020% of C, not more than 0.05% of Si, 0.10-0.50% of Mn, not more than 0.03% of P, 0.003-0.050% of S, 0.001-0.03% of Al, 0.001-0.015% of N, 0.005-0.050% of O, not more than 0.005% of Ca, not more than 0.005% of Mg, not more than 0.10% of Cu, not more than 0.10% of Cr, not more than 0.10% of Ni, not more than 0.10% of Mo, at least one of 0.0005-0.003% of B, not more than 0.01% of Nb, not more than 0.02% of V, and 0.001-0.05% of Ti, and the balance of Fe and other inevitable impurities, wherein N(%)*Ti(%) is not more than 3*10<-4>. Correspondingly, the invention further discloses a production method of the steel for enamel. The steel for enamel has excellent comprehensive performance.
Description
Technical field
The present invention relates to steel grade and method of manufacture thereof, relate in particular to a kind of enamel with steel and method of manufacture thereof.
Background technology
Enamel once technology is exactly not execute ground-coat enamel and directly execute cover-coat enamel and cover-coat enamel is fired a kind of enameling process on steel plate.The difference of enamel once technology and twice enameling process is: twice application of slip at first need be warded off one deck ground-coat enamel on end embryos such as steel plate; On ground-coat enamel, ward off one deck cover-coat enamel then again; Good bonding strength at the bottom of ground-coat enamel and the steel plate between embryo and ground-coat enamel and the cover-coat enamel, and help improving the scaling resistance ability.Therefore; Comparatively speaking; An application of slip to steel plate at the bottom of between embryo and the enamel coating adherence, scaling resistance and prevent bubble and the having relatively high expectations of defective such as stain because the squama that steel plate produces in the enamel process is quick-fried, adherence is bad and defective such as bubble can have a strong impact on the quality of enamel product.
Squama is quick-fried be application of slip system embryo when high temperature sintering, the water in the porcelain slurry or the iron of crystal water and surface of steel plate, carbon reaction generation atomic hydrogen are in process of cooling; Because the solubleness of hydrogen in steel sharply descends, if there are not enough suction hydrogen places in the steel, promptly stores hydrogen trap; Wasserstoffatoms then can be overflowed in a large number; Gather at steel plate and enamel coating interface, to a certain degree breaking through the enamel coating surface, produce that squama is quick-fried to be peeled off with very big pressure.
Adherence is the index that is used for weighing the firm degree of bonded between steel plate and the enamel coating.The bad then enamel coating of adherence is easy to peel off from surface of steel plate.
Pin hole is that bubble passes the defective that enamel coating is overflowed and formed the pin hole shape and cause because interior crystal water and the reaction of the carbon in the steel of porcelain slurry at high temperature generates bubble.
Enamel once is except having the requirement aspects such as adherence, scaling resistance, needle pore defects; Because the thin defectives such as bubble and stain that in sintering process, produce easily of enamel coating; Therefore the bubble that also requires steel plate in sintering process, to produce is few, to avoid producing similar defective.
For fear of producing the quick-fried defective of squama, prior art forms the storage hydrogen trap of capacity usually in steel, like microcavities, inclusion, dislocation, crystal boundary etc., or through adding the titanium of capacity, so that titanium forms inclusion in steel.
Publication number is CN 101535517A; The Chinese patent document that the open date is on September 16th, 2009 discloses significantly good enamel sheet and method of manufacture thereof of the quick-fried property of a kind of anti-squama; In this technical scheme, add Nb:0.055～0.25%, preferably added V:0.003～0.15%.Speed of cooling in the time of when continuous casting, need controlling casting blank solidification, have relatively high expectations for the refrigerative of strand in speed of cooling≤10 during promptly by 1/4 thick solidifying of strand thickness of slab ℃/s.
Publication number is JP2006-37215A; The Japanese documentation that the open date is on February 9th, 2006 discloses a kind of good adhesion enamelled enameling sheet that has; Its method of manufacture and enamel product thereof; This technical scheme adds the valuable alloying element more than at least a in Cu:0.051～8.0%, Ni:0.051～8.0%, Co:0.051～8.0%, Mo:0.051～8.0% in low-carbon (LC) or ultra low-carbon steel, and the add-on of alloying element is higher, but does not add Ca and Mg.
Summary of the invention
The object of the present invention is to provide a kind of enamel with steel and method of manufacture thereof; This enamel should have good scaling resistance and anti-bubble property with steel; Also should overcome black spot defect simultaneously, this enamel also should have higher intensity, good formability and good application of slip performance with steel in addition.
For achieving the above object, the invention provides a kind of enamel and use steel, its chemical element quality percentage composition proportioning is controlled to be: C≤0.020%; Si≤0.05%; Mn:0.10～0.50%; P≤0.03%; S:0.003～0.050%; Al:0.001～0.03%; N:0.001～0.015%; O:0.005～0.050%; Ca≤0.005%; Mg≤0.005%; Cu≤0.10%; Cr≤0.10%; Ni≤0.10%; Mo≤0.10%; Also contain at least a in B:0.0005～0.003%, Nb≤0.01%, V≤0.02%, Ti:0.001～0.05%, and N (%) * Ti (%)≤3 * 10 wherein
-4Surplus is Fe and other unavoidable impurities.
The principle of design of each the chemical element proportioning in the present technique scheme is following:
Carbon: in general, carbon content low formation more can be good more.In addition; In the present technique scheme; Carbon content in the steel plays significant effects to the enamel surface quality, can in the enamel process, generate more carbon monoxide when carbon content is too high in the steel, and the number of bubbles of its formation is many, volume is big; Can produce needle pore defect on the enamel surface under the serious situation, infringement enamel quality.So contriver's process is tested in a large number and checking is controlled at carbon content≤0.02%.
Silicon: element silicon forms oxide compound easily.In the present technique scheme, when silicone content is high, in hot rolling, form the inclusion of a large amount of poor ductility easily, and in the operation of rolling, can cause the processibility variation of steel, therefore silicone content is controlled to be≤0.05%.
Manganese: manganese is deoxidant element, can control the content of oxygen in the steel.Manganese can also generate manganese sulfide or oxygen manganese sulfide with reaction of Salmon-Saxl except forming manganese oxide.Simple manganese sulfide inclusion thing distributes through being elongated strip after rolling, influences the lateral performance of steel plate.In the present technique scheme, a spot of titanium elements can form compound nodule such as manganese sulfide titanium etc. in manganese element and the steel, and this type impurity can improve the disadvantageous effect of manganese sulfide to processing characteristics significantly.But the manganese too high levels can influence the enamelled adhesion property, and is easy to generate bubble and stain, so the content of manganese is controlled to be 0.10～0.50%.
Phosphorus: phosphorus gathers on the crystal boundary in steel easily partially, when enamel firing, is easy to generate bubble and stain, influences the enamelled surface quality.Therefore, in the present technique scheme, phosphorus is harmful element, and content is low more good more.
Sulphur: in general sulphur all be harmful element in steel, but in the present technique scheme, an amount of element sulphur plays a part useful.Sulphur not only can form manganese sulfide with manganese, can also form titanium sulfide with titanium etc., help improving scaling resistance can, therefore sulphur content is designed to 0.003～0.050%.
Aluminium: aluminium is strong deoxidant element, and aluminium content height can cause the reduction of oxygen content in steel.Because the alumina inclusion bad plasticity, and the processing characteristics that a large amount of alumina inclusions also can the heavy damage steel.Owing to need to keep a certain amount of oxygen, so aluminium content is unsuitable too high, controls it as 0.001～0.03% in the steel of the present invention.
Nitrogen: in the present technique scheme, behind the adding titanium elements, nitrogen preferentially forms the titanium nitride compound than carbon and sulphur in the steel, and it helps improving scaling resistance.Simultaneously, titanium nitride also helps suppressing growing up of ferrite crystal grain, in hot rolling and cold rolled annealed process, suppresses ferrite crystal grain on the one hand and grows up, and in the high temperature sintering process, prevents growing up unusually of ferrite crystal grain on the other hand.But because titanium nitride will generate at high temperature even in molten steel, therefore when the content of nitrogen and titanium was all higher, the solubility product of nitrogen and titanium was big so, and the formation temperature of titanium nitride is just high, and it is big that the particle of the titanium nitride of formation will become.For fear of forming the thick titanium nitride of particle, nitrogen and titanium should be controlled at N (%) * Ti (%)≤3 * 10
-4So not only the particle of formed titanium nitride tiny, be evenly distributed, can also improve scaling resistance can with suppress ferrite crystal grain and grow up.Take all factors into consideration, nitrogen content is controlled at 0.001～0.015%.
Oxygen: in the present technique scheme, oxygen can directly influence the scaling resistance and the processing characteristics of steel.The oxygen level of control in the steel not only helps decarburization, and oxygen all is easy to combine the formation oxide compound with multiple element, helps forming a certain amount of oxide compound.Oxygen is essential element in the present invention, but its content is also relevant with titanium.In order to prevent to form thick oxide inclusion in the steel, must control Control for Oxygen Content below 0.05%, so oxygen level in the present invention is 0.005～0.05%.
Calcium and magnesium: calcium and magnesium can improve the form of steel inclusion such as manganese sulfide etc., avoid forming the inclusion of strip, help improving the plasticity of steel.Therefore calcium and magnesium all are controlled to be≤0.005%.
Copper: in the present technique scheme, copper is residual element.The copper too high levels, formability descends.
Chromium: in the present technique scheme, chromium is residual element.Chromium also forms oxide compound easily in steel, make that surface of steel plate is acidproof to wash.During too high levels, not only influence the firing temperature that adherence between enamel coating and the steel plate also can corresponding raising steel plate.
Nickel: in the present technique scheme, nickel is residual element.Nickel can form oxide compound in steel, the nickel oxide that particularly forms on the surface can make that surface of steel plate is acidproof to be washed.During the nickel too high levels, not only be unfavorable for improving the adhesion property of steel plate, the firing temperature of steel plate is risen.
Molybdenum: in the present technique scheme, molybdenum also is residual element.The molybdenum too high levels can increase the solidity to corrosion of steel plate, thereby influences the pickling speed of steel plate.
Boron: boron gathers at the crystal boundary place easily partially, and in the present technique scheme, it can improve scaling resistance and adherence.Though boron has above-mentioned beneficial effect, in the present technique scheme, the boron too high levels can crack on strand in casting process.So the contriver is controlled at 0.0005～0.003% with the content of boron.
Niobium: in the present technique scheme, though niobium is favourable for improving scaling resistance, niobium is a noble metal, taking cost into account, does not add a large amount of niobiums especially.Allow residual niobium in the present invention.
Vanadium: in the present technique scheme, vanadium can combine to separate out vanadium nitride and vanadium carbide with nitrogen, carbon, and these second phase particles not only play a part to strengthen matrix, and is effectively to prevent in the enamel process, to take place the quick-fried storage hydrogen trap of squama.When nitrogen content was higher, the main and nitrogen of vanadium was combined in high temperature and separates out comparatively stable vanadium nitride, has good strengthening effect and the quick-fried effect of anti-squama.Take all factors into consideration, content of vanadium is controlled to be≤0.02%.
Titanium: titanium is strong carbon, nitride forming element.Titanium can combine with oxygen, carbon, nitrogen and sulphur etc., both can form single compound, can form the compound compound again, can improve the plasticity and the scaling resistance of steel plate after titanium fixed carbon, nitrogen and the sulphur.The compound that titanium and oxygen and nitrogen form is very stable comparatively speaking, is difficult for receiving the influence of processing parameter in hot-work and the enamel process, and is also very effective to the needle pore defect and the adhesion property that improve steel plate.But titanium and oxygen very easily form compound, if titanium and too high oxygen level in the steel can form thick oxide inclusion, seriously damage the plasticity of steel.So the present technique scheme is controlled at 0.001～0.05% with titanium content.
Correspondingly, the present invention also provides the method for manufacture of this enamel with steel, and it comprises the following steps:
(1) smelts vacuum outgas;
(2) casting;
(3) strand is carried out hot rolling: control hot rolling Heating temperature is 950～1200 ℃; Rolling in two stages, the fs is rolling in the austenitic area, and finishing temperature is 900～1100 ℃; Subordinate phase is rolling at ferrite area; Finishing temperature (FT, ℃) satisfy formula 600≤FT≤-9250 * C+900, wherein C is the quality percentage composition of element;
(4) batch;
(5) pickling is to remove iron scale;
(6) cold rolling;
(7) annealing.
Preferably, in the method for manufacture of above-mentioned enamel, add brown iron oxide in the smelting process of step (1) with steel; The add-on of brown iron oxide is steel 0.40～2.50kg per ton; Add the back and fully stir, churning time is no more than 30 minutes, makes O >=0.010～0.050% in the molten steel.
Preferably, in the method for manufacture of above-mentioned enamel with steel, nitrogen blowing after the vacuum outgas of step (1).
In the method for manufacture of above-mentioned enamel with steel, the castmethod in the step (3) is continuous casting or die casting.
In the method for manufacture of above-mentioned enamel with steel, the coiling temperature in the step (4) is 500～800 ℃.
In the method for manufacture of above-mentioned enamel with steel, total draft cold rolling in the step (6) is controlled at more than 60%.
In the method for manufacture of above-mentioned enamel with steel, annealing temperature is 650～900 ℃ in the step (7), and annealing time is 2 minutes～25 hours.
In technique scheme, guarantee that in smelting and vacuum outgas step the basic chemical ingredients of molten steel meets the requirements, decarburization is also removed the obnoxious flavoures such as hydrogen in the steel; Stir through blowing argon gas, the H＜2ppm in the control steel adds necessary alloying element; Carry out the composition adjustment; Particularly will control elements such as carbon, nitrogen, sulphur and oxygen, because they can form the scaling resistance that all cpds helps improving steel, but excessive inclusion can damage the formability of steel again.When oxygen level is higher in requiring steel plate, in smelting process, can or adds brown iron oxide and come stably to control the total oxygen in the steel, make it to reach desired target value through oxygen blast.Wherein, The adding brown iron oxide is an optimized technical scheme, this be because, when the carbon content in the steel is higher; Adopt oxygen blown method to improve oxygen level and can in casting cycle, very easily produce boiling; Casting problem such as bleed-out when excessive boiling is prone to cause continuous casting, and adopt the method that adds brown iron oxide, can avoid the excessive boiling of molten steel.In addition, the method for employing adding brown iron oxide is replenished and is improved the oxygen level in the steel, both can shorten refining time, can practice thrift cost again.In addition, handle the back nitrogen blowing or add nitrogenize ferromanganese, can improve the nitrogen content in the steel in vacuum outgas.Nitrogen blowing is an optimized technical scheme, and this is because add nitrogenize ferromanganese meeting carburetting, therefore carbon is required extremely low steel, and nitrogen flushing can prevent carburetting, adopts the nitrogen flushing mode can practice thrift cost, can stablize the nitrogen content in the control steel again.
When soft steel or ultra-low carbon steel adopted traditional hot rolling technology, ferrite crystal grain was generally bigger.Therefore, in the present technique scheme, two stage rolling are adopted in hot rolling, and the fs is rolling in the austenitic area, and subordinate phase is rolling at ferrite area.Because subordinate phase is rolled in ferritic, can store more deformation energy, help the refinement ferrite crystal grain, obviously improve armor plate strength, overcome the problem that the ultra low-carbon steel grain refining is difficult, intensity is lower.And the ferrite crystal grain of refinement is more useful to improving ys and steel plasticity after cold rolling, annealing.Heating temperature at the rolling steel billet of ferrite area is lower than the Heating temperature of pair rolling, therefore can reduce the heating energy consumption significantly, improves process furnace output.Low temperature rolling also can reduce the generation of secondary oxidation iron sheet, improves the surface quality of hot-rolled product, can reduce production costs greatly.Through rolling at ferrite area, the hot rolling microstructure of steel plate and process are cold rolling to be ferritic or ferritic+cementite with the later tissue of annealing.Simultaneously, the rolling lesser temps that all adopts of fs and subordinate phase is to cut down the consumption of energy.
In the present technique scheme, along with the raising of cold rolling draft, the inner distortional strain energy of steel plate increases, and in steel, to store enough distortional strain energies, therefore adopts higher cold rolling draft to help recrystallize and texture evolution after annealing.
In the present technique scheme, annealing can select to adopt the mode of continuous annealing or bell-type annealing.The annealing process that the present technique scheme relates to can be guaranteed the abundant development of ferritic structure completion recrystallize, grain growth and recrystallization texture in the steel.
Compared with prior art, the present invention has following beneficial effect through adopting technique scheme:
(1) enamel that utilizes the present technique scheme to produce can reach over-all properties with steel and require: ys: Rp0.2>=180MPa, tensile strength: Rm>=270MPa; Unit elongation: A
80>=36%, have good plasticity and higher intensity;
(2) enamel of the present invention has good application of slip performance with steel, has scaling resistance, the advantage of anti-bubble and stain;
(3) enamel of the present invention has good formability with steel, can be processed into various comparatively complicated enamel parts, owing to have higher intensity, has improved the non-deformability when high temperature burns till.
Description of drawings
Fig. 1 has shown the metallographic structure of embodiment of the invention A enameling sheet.
Embodiment
Embodiment A-H:
Make enamel of the present invention according to following step and use steel, the chemical element proportioning of controlling each embodiment (each embodiment concrete processing parameter referring to table 2) as shown in table 1:
(1) smelt, vacuum outgas: add brown iron oxide in the smelting process, the add-on of brown iron oxide is steel 0.40～2.50kg per ton, adds the back and fully stirs, and churning time is no more than 30 minutes, makes O >=0.010～0.050% in the molten steel; Blowing argon gas stirs after the vacuum outgas, H＜2ppm in the control steel, when N >=(0.002～0.015wt%), handle the back nitrogen blowing in vacuum outgas;
(2) continuous casting;
(3) strand is carried out hot rolling: control hot rolling Heating temperature is 950～1200 ℃; Rolling in two stages, the fs is rolling in the austenitic area, and temperature is 900～1100 ℃; Subordinate phase is rolling at ferrite area; Finishing temperature (FT, ℃) satisfy formula 600≤FT≤-9250 * C+900, wherein C is the quality percentage composition of element;
(4) batch: coiling temperature is 500～800 ℃;
(5) pickling is to remove iron scale;
(6) cold rolling: total draft is controlled at more than 60%;
(7) annealing: annealing temperature is 650～900 ℃, and annealing time is 2 minutes～25 hours.
Associative list 2 can find out with table 1, adopts above-mentioned composition design and processes parameter to smelt and processes the ys>=180MPa of its finished product steel plate, tensile strength>=270MPa, unit elongation A
80>=36%, have good plasticity and higher intensity.Through counterenamel, do not take place fish-scaling effectly, the adherence of steel plate and enamel is good, has performances such as defective such as good anti-bubble and stain.
As can beappreciated from fig. 1, the microstructure among the embodiment of the invention A is a ferritic structure, has a spot of inclusion to be distributed on ferritic intragranular or the crystal boundary.
The chemical ingredients proportioning of table 1. various embodiments of the present invention (the quality percentage composition, wt%)
| Embodiment | C | Si | Mn | P | S | Al | O | N | B | Ca | Mg | Ti | Cu | Cr | Ni | Mo | Nb | V |
| A | 0.002 | 0.003 | 0.28 | 0.011 | 0.030 | 0.001 | 0.050 | 0.0037 | - | - | - | - | 0.04 | 0.01 | 0.02 | 0.03 | 0.002 | 0.01 |
| B | 0.002 | 0.003 | 0.32 | 0.009 | 0.033 | 0.005 | 0.050 | 0.0046 | 0.0029 | - | - | - | 0.03 | 0.03 | 0.02 | 0.02 | 0.001 | 0.005 |
| C | 0.020 | 0.018 | 0.25 | 0.007 | 0.003 | 0.020 | 0.008 | 0.001 | 0.0005 | - | 0.0005 | 0.05 | 0.10 | 0.02 | 0.10 | 0.02 | 0.010 | 0.005 |
| D | 0.002 | 0.021 | 0.26 | 0.010 | 0.005 | 0.010 | 0.005 | 0.004 | - | 0.0025 | - | 0.05 | 0.05 | 0.10 | 0.03 | 0.10 | 0.001 | 0.002 |
| E | 0.0005 | 0.020 | 0.30 | 0.012 | 0.050 | 0.005 | 0.010 | 0.015 | 0.003 | - | 0.005 | 0.01 | 0.01 | 0.05 | 0.02 | 0.05 | 0.001 | 0.001 |
| F | 0.001 | 0.050 | 0.10 | 0.030 | 0.008 | 0.005 | 0.015 | 0.002 | 0.001 | - | - | - | 0.10 | 0.03 | 0.02 | 0.02 | 0.001 | 0.001 |
| G | 0.020 | 0.015 | 0.25 | 0.007 | 0.010 | 0.020 | 0.010 | 0.015 | - | 0.005 | - | 0.02 | 0.02 | 0.05 | 0.02 | 0.02 | 0.001 | 0.02 |
| H | 0.004 | 0.020 | 0.50 | 0.009 | 0.008 | 0.030 | 0.035 | 0.003 | - | 0.0005 | 0.0005 | 0.005 | 0.05 | 0.03 | 0.01 | 0.01 | 0.001 | 0.008 |
The concrete processing parameter and the performance of table 2. various embodiments of the present invention
Claims (8)
1. an enamel is used steel, it is characterized in that, its chemical element quality percentage composition is:
C≤0.020%；
Si≤0.05%；
Mn：0.10～0.50%；
P≤0.03%；
S：0.003～0.050%；
Al：0.001～0.03%；
N：0.001～0.015%；
O：0.005～0.050%；
Ca≤0.005%；
Mg≤0.005%；
Cu≤0.10%；
Cr≤0.10%；
Ni≤0.10%；
Mo≤0.10%；
B:0.0005～0.003%, Nb≤0.01%, V≤0.02%, at least a in Ti:0.001～0.05%;
Surplus is Fe and other unavoidable impurities;
N (%) * Ti (%)≤3 * 10 wherein
-4
2. enamel as claimed in claim 1 is characterized in that with the method for manufacture of steel, comprises the following steps:
1) smelts vacuum outgas;
2) casting;
3) strand is carried out hot rolling: control hot rolling Heating temperature is 950～1200 ℃; Rolling in two stages; Fs is rolling in the austenitic area, and finishing temperature is 900～1100 ℃, and subordinate phase is rolling at ferrite area; Finishing temperature FT satisfies formula: 600≤FT≤-9250 * C+900, and wherein C is the quality percentage composition of element;
4) batch;
5) pickling;
6) cold rolling;
7) annealing.
3. enamel as claimed in claim 2 is with the method for manufacture of steel; It is characterized in that; In the smelting process of said step (1), add brown iron oxide, the add-on of brown iron oxide is steel 0.40～2.50kg per ton, adds the back and fully stirs; Churning time is no more than 30 minutes, makes O >=0.010～0.050% in the molten steel.
4. enamel as claimed in claim 2 is characterized in that with the method for manufacture of steel, nitrogen blowing after the vacuum outgas of said step (1).
5. enamel as claimed in claim 2 is characterized in that with the method for manufacture of steel the castmethod in the said step (3) is continuous casting or die casting.
6. enamel as claimed in claim 2 is characterized in that with the method for manufacture of steel the coiling temperature in the said step (4) is 500～800 ℃.
7. enamel as claimed in claim 2 is characterized in that with the method for manufacture of steel total draft cold rolling in the said step (6) is controlled at more than 60%.
8. enamel as claimed in claim 2 is characterized in that with the method for manufacture of steel annealing temperature is 650～900 ℃ in the said step (7), and annealing time is 2 minutes～25 hours.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102648471A CN102747309A (en) | 2012-07-27 | 2012-07-27 | Steel for enamel and production method thereof |
| PCT/CN2013/080157 WO2014015823A1 (en) | 2012-07-27 | 2013-07-26 | Ceramic-enameling steel and manufacturing method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102648471A CN102747309A (en) | 2012-07-27 | 2012-07-27 | Steel for enamel and production method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102747309A true CN102747309A (en) | 2012-10-24 |
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ID=47027794
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| CN2012102648471A Pending CN102747309A (en) | 2012-07-27 | 2012-07-27 | Steel for enamel and production method thereof |
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| WO (1) | WO2014015823A1 (en) |
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